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Science Experiments

Experiments often conducted by students to test different scientific theories and hypotheses

11,111 Questions

Would a toy car go faster or slower down a ramp with sandpaper compared to a ramp with no sandpaper?

-- Steeper ramp.

-- Lower friction in the wheel and axle bearings of the car.

-- Better aerodynamic streamlining of the shape of the car.

-- Make the car of iron and conceal a large magnet at the bottom of the ramp.

What is a factor in a experiment that you measure to gather results?

It is a variable. The independent (manipulated) variable is the factor that is different between the control and experimental groups. The dependent variable is the difference resulting from the independent variable. The controlled variables are the factors that are not changed in the experiment between the control and experimental groups.

Why is it important for a scientist to use controlled experiments where only one factor is changed and the rest remain constant?

Because the goal of an experiment is to figure out the cause and effect of something on something else. Without a control variable(s), any number of causes could produce the observed effect, making it very difficult to determine exactly which cause produced the observed effect.

What is the independent variable in Todd's experiment?

There is no independent variable for the experiment described below,

since there is no experiment described below.

3 What are some advantages and disadvantages of having an exoskeleton?

There is not really an advantage, unless u mean if the killer has an advantage, then it becomes a yes or no answer

yes: they can easily break exoskeleton if it is fragile

no: you will be safe from harm

What color does lavender and red make when mixed?

Lavender is a pastel purple (1 part purple + 1 part purple).

Purple is a secondary colour (1 part red + 1 part blue)

Red is a primary colour.

So if you mix this all together you will get:

1 part red + 1 part white + 1/2 part red + 1/2 part blue = a pastel of the tertiary colour red-purple or a pinky lavender.

How do moles use sound?

Assuming that you mean vibrations, they use it to determine where prey items such as insects and worms are in the ground and where there may be hollows or obstructions. This allows them to more easily catch prey and avoid danger. Vibrations also allow moles to navigate their tunnels since they are usually blind and the tunnels are pitch black.

What is the negatively charged electrode of a cathode ray tube?

The negatively charged electrode of a cathode ray tube (CRT) is the cathode. The tube is a cathode ray tube, and electrons stream off the cathode, are accelerated across the evacuated space and "directed" either electromagnetically or electrostatically, and then strike the phosphor coating on the positively charged anode at a "location" determined by the "directing" elements.

What direction does the ground surface move during an earthquake?

The Earth moves in response to tectonic forces which move the plates around, causing friction and the release of friction between adjoining plates, the creation of mountains, and the subduction and creation of crust. All of these movements can result in earthquakes.

What happens when Eno is put in water?

The powder gives off carbon dioxide bubbles when mixed with water. The bubbles try to escape to the surface.

If you block that off by putting a lid on the pot it is in, the bubbles will cause a build up of Carbon dioxide. If you pop the lid off with your thumb the lid will fly across the room due to the reaction that occurred.

What causes seed germination to begin?

germination begins when seed tissues absorb water.

How often is a star born in our galaxy?

Well, I am not exactly sure what you mean but the Sun is located 26,000 light-years from the galaxy's center in one of the spiral arms. In the galaxy, all stars orbit around a central region or core. It takes about 225 million years for the sun to orbit the center of the Milky Way. That's as much infotmation as I can give to you. Hope that helped and your question is somewhat answered. :D

What is particle size distribution in sieve analysis?

Distribution of soil particles for identifying the type of soils ie., wherther it is well graded or uniform graded or poorly graded soil.And also fine sand, medium sand coarse sand or fine gravel, medium gravel, coarse gravel etc.

Why do things melt?

their temperature rises above their meting points. This causes the particles to vibrate so fast that that all spread apart, causing a liquid to form.

What is a conclusion in a science experiment?

A Conclusion is the opinion formed after reviewing the evidence of your experiment. Conclusion also means the results of your hypothesis. ex: My hypothesis is most people drive a mini van than a jeep.

My conclusion is most people drive a jeep than a mini van.

so it's kind of the answer to your hypothesis but not all the way through though.

What are example of a plant experiment?

You can make a maze for the branch or branches of the potato to grow out of the box.

Put your potato in a shoebox at the very end with some fertilizer, and a hole at the other end. Then put obstacles in the box, so your potato branch can make its way through the hole. You can also identify something that has starch. To find out if that thing contains starch, you have to put iodine on it, and see if the thing changes into a blue to purpleish colour.

Which is a strong acid-pH 1 or pH 6?

A pH of 1 is considered a stronger acid compared to a pH of 6. The pH scale is logarithmic, so each integer difference represents a tenfold difference in acidity. Therefore, a pH of 1 is ten times stronger in terms of acidity than a pH of 2.